Process for the fixation of nitrogen by means of ferro-aluminium.



pair 7 PAUL BUNET, 0F PARIS, FRANCE, ASSIGNOR TO SOCIETE ennnnannnns mrnunns, or

PARIS, FRANCE, A CORPORATION OF FRAN PROCESS FOR THE FIXATION 0F NITROGEN BY MEANS OF FERBO-ALUMINIUM.

No Drawing.

To all whom it may concern:

vented a new and useful Improvement in Processes for the Fixation of Nitrogen by Means of F erro-Aluminium, of which the following. is a specification.

In the specifications of U. S. patent applications filed December 20, 1913, under Serial No. 807,915, filed December 23, 1913, under Serial No. 808,478, and filed November 18, 1914, under Serial Number 872,837, various processes for the fixation of nitrogen by means of ferro-aluminium are described. The surprising fact has been ascertained that, in these various processes, when to the ferro-aluminium a certain quantity of calcium carbid is added, the fixation of the nitrogen is considerably hastened and increased in such a Way that the operator can fairly rapidly reach and even exceed the theoretical proportion of nitrogen which the aluminium contained in the ferro-alu- Ininium is capable of fixing.

In the preparation of the ferro-aluminium st' rting from bauxite, which generally concopies oi this patent may be obtained for five cents each, by addressing the Specification of Letters Patent. Application filed April 3, 1915. Serial No. 19,062.

Patented Aug. 'ee, 'ieie.

tains a little lime, it is possible that'there may be formed incidentally, a little calcium carbid, but even in the case where it is so formed the quantity thus produced is less than the quantity which should be added to obtain the most favorable result.

By way of example, if a mixture of 200 kilograms ferro-aluminium (42 per cent. of

aluminium) with kilograms of calcium carbid (54 per cent. of heat in a current of nitrogen, a product can be obtained, containing as much as 44.75 kilograms of nitrogen, which is more than the aluminium content alone is theoretically capable of fixing.

I claim as my invention In the processes of fixation of nitrogen on ferro-aluminium by subjecting a mass containing ferro-aluminium to a current of nitrogen, adding calcium carbid to' said mass. In testimony whereof I have signed my name to this specification," in the presence of two subscribing witnesses.

PAUL BUNET. Witnesses: CHARLES Donoo,

Dr. W. C. PooLn,'Jr.

Commissioner of Patents,

Washington',1). 0.

CaC be treated with 

